Specifications

Cinterion
®
EHS5-E/EHS5-USR4 Hardware Interface Overview
2.1 Application Interface
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 ehs5_hio_v04.000 2019-01-16
Confidential / Preliminary
Page 16 of 46
The figure below shows a circuit to connect an external SIM card holder.
Figure 5: External UICC/SIM/USIM card holder circuit
The total cable length between the SMT application interface pads on EHS5-E/EHS5-USR4
and the pads of the external SIM card holder must not exceed 100mm in order to meet the
specifications of 3GPP TS 51.010-1 and to satisfy the requirements of EMC compliance.
To avoid possible cross-talk from the CCCLK signal to the CCIO signal be careful that both
lines are not placed closely next to each other. A useful approach is using a GND line to shield
the CCIO line from the CCCLK line.
2.1.5 Digital Audio Interface
Four EHS5-E/EHS5-USR4 GPIO lines can be configured as digital audio interface (DAI). The
DAI can be used to connect audio devices capable of pulse code modulation (PCM). The PCM
functionality allows for the use of an external codec like the W681360.
2.1.6 GPIO Interface
EHS5-E offers a GPIO interfacewith 17 GPIO lines. The GPIO lines are shared with other in-
terfaces or functions: Fast shutdown (see Section 2.1.12), status LED (see Section 2.1.11), the
PWM functionality (see Section ), an pulse counter (see Section 2.1.10), ASC0 (see Section
2.1.2), ASC1 (see Section 2.1.3), an SPI interface (see Section 2.1.8) and a PCM interface
(see Section 2.1.5)
The following table shows the configuration variants for the GPIO pads. All variants are mutu-
ally exclusive, i.e. a pad configured for instance as Status LED is locked for alternative usage.
SIM
CCVCC
CCRST
CCIO
CCCLK
220nF
1nF
CCIN
V180